4 OF THE SEEDS OF DAVIDIA INVOLUCRATA. 559 
Davidia is usually placed in the Cornacem, next to Nyssa, a 
genus of Asiatic and North American trees, which it resembles 
( in some particulars, but from which it differs greatly in appearance 
and floral structure. However, I do not intend to discuss its 
affinities on this occasion. 
Miss M. Smith’s careful drawings in the Plate, explained below, 
. show what I have attempted to describe in the germination of 
Davidia. 
f 
EXPLANATION OF PLATE 19. 
) Davidia involucrata, Baill. 
Fig, 1. A ripe fruit. 
2. The same with the outer layers of the pericarp removed and one of 
the valves opening nearly to the base. 
3. Cross-section of a fruit in which seven of the cells are fertile. 
_ 4. Cross-section of a fruit in which only one of the cells is fertile. 
5. A fruit from which the valves have fallen away and the seeds have 
begun to germinate. 
6. Dorsal view of one of the valves. 
’ 7. Ventral view of the same. 
8. Cross-section of a seed. 
9. A germinating seed. 
10. Section of germinating seed showing the highly developed plumule 
and one cotyledon. 
11. A portion of the embryo from the same seed. 
12. Section of old, empty fruit. 
13. A seedling showing buds in the axils of the cotyledonary leaves, first 
pair of foliage-leaves opposite and succeeding ones alternate. 
a a | 
* 
Figs. 6-10, & 11 are more or less enlarged, most of them, as will be seen 
| Figs. 1-5, 12, & 13 are natural size. 
by comparison, only very slightly. 
